• Journal of the Korean Applied Science and Technology
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• v.38 no.6
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• pp.1455-1465
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• 2021

The purpose of this research was to investigate the mediating effect of grit on the relationship between leisure sport participation and academic efficacy/peer relationship of senior elementary school students. For this purpose, we analyzed the data of 2,437 fourth-grade elementary school students derived from the 2nd years of the Korean Children and Panel Survey(KCYPS, 2018). Structural Equation Modelling(SEM) were conducted through PASW Statistics 18 and AMOS Graphics 18 programs. The main results were as follows. First, grit fully mediated the association between leisure sport participation and academic efficacy. Second, the relationship between leisure sport participation and peer relationship was partially mediated by grit. The conclusion we could draw from these results was that participating in leisure sport with sweating intensity had a positive effect on the grit of senior elementary school students, which in turn had a positive effect on academic efficacy and peer relationship. Finally, we discussed the implications of leisure sport participation for senior elementary school students.

• Journal of Industrial Convergence
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• v.20 no.9
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• pp.91-98
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• 2022

This study was conducted to investigate the effect on subjective well-being and depression of the elderly with chronic diseases. Using data from the 15th Korea Welfare Panel in 2020, 3,910 people who responded that they had chronic diseases over the age of 65 were analyzed with stepwise regressions. As a result, the factors affecting the subjective well-being of the elderly with chronic diseases were in the order of satisfaction with leisure life, subjective health status, satisfaction with children relationship, satisfaction with family income, satisfaction with spouse. The explanatory power of this model was 32.0% (F=351.44 p<.001). And also, factors affecting depression were in order of subjective health status, satisfaction with spouse, satisfaction with social relationship, satisfaction with children relationship, satisfaction with leisure life, and satisfaction with family income. The explanatory power of this model was 21.4% (F=178.59, p<.001). Therefore, policy systems to support leisure life of the elderly with chronic disease and measures to induce participation in programs using community resources are needed. And health management programs and institutional support to improve subjective health status are also needed. In addition, it is expected that economic support at the national policy level and various program execution strategies and support personnel will be secured at the community level.

• Korean Journal of School Psychology
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• v.18 no.2
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• pp.269-290
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• 2021

This study was conducted to examine the moderated mediation effect of self-esteem through internet overdependence on the effect of academic stress on depression and anxiety. Surveys were conducted as part of the 13th wave of the Korea Welfare Panel Study. The survey included academic stress, internet overdependence, depression and anxiety, and self-esteem scales. A total of 383 middle school students completed surveys. Data was analyzed using SPSS 21.0 and SPSS PROCESS Macro. There were three major results. First, internet overdependence partially mediation the effect of academic stress on depression and anxiety. Second, self-esteem moderated the relationship between internet overdependence and depression and anxiety. Third, self-esteem also moderated the mediating effect of academic stress on depression and anxiety through internet overdependence. These results indicate that self-esteem is a protective factor against the negative effects of internet overdependence on mental health and of academic stress on depression and anxiety in middle school students. This paper discusses the implications of these results, this study's limitations, and suggestions for future studies.

• Journal of Family Resource Management and Policy Review
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• v.27 no.2
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• pp.1-17
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• 2023

This study examined the relationship between family-friendly community characteristics and the life satisfaction of working mothers with elementary school children, and investigated whether the relationship was mediated by work-family conflict and facilitation of working mothers. For the analysis, the study used the response data of 627 working mothers from the 11th wave of the Panel Study on Korean Children (PSKC, 2019) and multi-mediation effect analyses were conducted using PROCESS. The main results are as follows. First, the higher neighbor support, the higher the work-family facilitation, which significantly increased life satisfaction. Second, the appropriateness of parenting environment and community service infrastructure satisfaction showed significant indirect effects with life satisfaction through increasing work-family facilitation and lowering work-family conflict. Moreover, the appropriateness of parenting environment was positively related with life satisfaction and it was a only variable that was directly associated with life satisfaction. On the other hand, the convenient access to community service infrastructure was found to lower work-family facilitation and lower life satisfaction, confirming the need for follow-up studies. This study shows that the family-friendly characteristics of the community are important for working mothers with elementary school-age children and provides empirical evidence to improve the family-friendly community characteristics.

• Industry Promotion Research
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• v.8 no.3
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• pp.69-78
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• 2023

Based on the perception that integrated retirement preparation in various areas is needed in preparation for increased old age, this study aims to identify the status and characteristics of retirement preparation of middle-aged people and reveal the relationship with successful aging. In addition, it aims to find out the mediating effect of social support in the relationship between retirement preparation and successful aging for the middle-aged. To confirm this, 1,037 men and women aged 50 to 64 who responded to the third, fourth, and fifth additional surveys of the Korean Retirement & Income Study (KReIS) conducted by the National Pension Research Institute were analyzed. When the preparation of middle-aged people for retirement affects successful aging, bootstrapping with IBM SPSS 26 Process Macro Model 4 was conducted to verify the mediating effect of social support. As a result of verifying the significance of independent variables on the parameters, preparation for retirement was positively (+) significant. In other words, it was verified that the higher the preparation for retirement, the higher the social support. Furthermore, it was discovered that social support, an independent variable, had a significant impact on successful aging, and social support, an independent variable, had a significant impact on successful aging. The results of this study suggest the need for social support for successful aging through the preparation of middle-aged people for retirement. It is intended to derive policy implications for preparing for retirement and provide them as basic data to increase the level of successful aging.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.5A
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• pp.443-462
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• 2010

The strut-tie model approach has proven to be effective in the ultimate analysis and design of structural concrete with disturbed regions. For the reliable analysis and design by the approach, however, the effective strength of concrete struts must be determined accurately. In this study, the validity of the effective strength of concrete struts, presented by the several design codes and many researchers including the author, was examined through the ultimate strength analysis of 24 reinforced concrete panels, 275 reinforced concrete deep beams, and 218 reinforced concrete corbels by using the conventional linear strut-tie model approach of current codes. The present study shows that the author's approach, resulting in an accurate and consistent evaluation of the ultimate strength of the panels, deep beams, and corbels, may reflect rationally the effects of primary variables including the types of strut-tie model and structural concrete, the conditions of load and geometry, and the strength of concrete in the strut-tie model analysis and design of structural concrete.

• 한국노년학
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• v.31 no.4
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• pp.1247-1263
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• 2011

The rapidly aging society entails the increases of medical service utilizations among the elderly. Medical services utilized by the elderly influence their life satisfaction. However, little is known about the effects of medical service utilizations on life satisfaction. Much less is known about whether the effects of medical service utilizations on life satisfaction tend to vary by the presence of chronic health conditions. Including 3,944 individuals aged 65 and over who participated in the 3rd wave of Korean Welfare Panel Study, the current study aims to examine (1) the relationships between medical service utilizations and life satisfaction and (2) whether the effects of medical service utilizations on life satisfaction vary by the presence of chronic health conditions. Data were processed through structural equation modeling(SEM) and multi-group SEM. Results indicate that (1) levels of both outpatient and inpatient service utilizations are related to life satisfaction, whereas levels of health monitoring service utilizations are not and (2) the effects of medical service utilizations varied by the chronic health condition status of the elderly. These results indicate that, in order to enhance levels of life satisfaction, medical services should be strategically utilized by the elderly depending on their chronic health condition status. Based on the findings, we discussed implications for practice and policy, suggesting future research directions based on the limitations of the current study.

• 한국노년학
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• v.31 no.2
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• pp.321-341
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• 2011

The purpose of this study is to examine income composition elements, poverty rate, and the effects of the transfer income on poverty decrease comparing grandparents-grandchildren households with living alone, couple, and living with adulthood children. Data come from the first(2005) and the second(2007) Korean Retirement and Income Study(KReIS) and the effects of poverty decrease is examined through reconstruction of LIS income definition. The main findings are as follows. First, the total income of the grandparents-grandchildren in 2006 is the lowest and about one-fourth of the households living with adulthood children. Second, the labor income of all households are increasing but the only grandparents-grandchildren's labor income is decreasing. Third, three of ten in grandparents- grandchildren households are in poverty, the poorest households's type is the grandparents-grandchildren in 2006. Fourth, four of ten in grandparents-grandchildren is able to escape poverty after including private and public transfer income. Especially, the effects of the public transfer income in grandparents-grandchildren households is lower in 2006 than in 2004, thus the role of public income security is strongly needed. Existing research was that the poorest type among the elderly group was the living-alone households, but this results show that grandparents -grandchildren households are the poorest group. Thus, income security policy is highly needed for poor skipped-generation households.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.122-124
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• 2022

Handling Passenger Traffic is the main challenge for designing an elevator group-control algorithm. Advanced control systems such as Hyundai's Destination Selection System(DSS) lets passengers select the destination by pressing on a selecting screen, and the systems have shown great efficiency. However, the algorithm cannot be applied to the general elevator control system due to the expensive cost of the technology. Often many elevator systems use Nearest Car(NC) algorithms based on the SCAN algorithm, which results in time efficiency problems. In this paper, we designed an elevator group-control algorithm for specific buildings that have approximate timetable data for most of the passengers in the building. In that way, it is possible to predict the destination and the location of passenger calls. The algorithm consists of two parts; the waiting function and the assignment function. They evaluate elevators' actions with respect to the calls and the overall situation. 10 different timetables are created in reference to a real timetable following midday traffic and interfloor traffic. The specific coefficients in the function are set by going through the genetic algorithm process that represents the best algorithm. As result, the average waiting time has shortened by a noticeable amount and the efficiency was close to the known DSS result. Finally, we analyzed the algorithm by evaluating the meaning of each coefficient result from the genetic algorithm.

• 한국노년학
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• v.39 no.4
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• pp.699-721
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• 2019

The purpose of this study was to examine and compare factors affecting the subjective life expectancy among the elderly, and to suggest health practice and social welfare service implications for later life. A total of 4,483 seniors from the 6th wave(2016) of the Korean Longitudinal Study on Aging (KLoSA) were used for analysis. The subjects were divided into three age groups: the young-old (n=2,106, 65~74 years), middle-old (n=1,803, 75~84 years), and oldest-old (n=574, 85 years and older). Control variables were sociodemographic factors and health status factors. Independent variables were health promotion behavior, cognition of public care, participating social activity, economic activity, and receiving basic pension. The data were analyzed using hierarchical multiple regression. The main results were as follows. Health promotion behavior was associated with the young-old. Social activities and economic activity were associated with the young-old and middle-old. Receiving basic pension had a significant impact on all age groups. In the middle-old, significant results were focused on socio-demographic and health status factors compared to other groups. The results of this study will provide basic data for the elderly policy and welfare service and will help to find and improve the important factors for the life of the elderly.